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anonymous
 one year ago
A fair coin is tossed 4 times in a row. If X is the number of heads counted, which table gives the probability distribution of X?
anonymous
 one year ago
A fair coin is tossed 4 times in a row. If X is the number of heads counted, which table gives the probability distribution of X?

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rational
 one year ago
Best ResponseYou've already chosen the best response.1whats the probability for getting heads on all 4 coins ?

rational
 one year ago
Best ResponseYou've already chosen the best response.1may i know why do you think it is 1/2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0its a 50/50 chance to land on head.

rational
 one year ago
Best ResponseYou've already chosen the best response.1its a 50/50 chance to land head on one coin

rational
 one year ago
Best ResponseYou've already chosen the best response.1but when you have four coins, the probability for landing heads on "ALL" four coins need not be 1/2 right

rational
 one year ago
Best ResponseYou've already chosen the best response.1the probability is actually 1/2*1/2*1/2*1/2 = 1/16

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh sorry. 4 coins. my bad

rational
 one year ago
Best ResponseYou've already chosen the best response.1Yes, another question whats the probability for getting NOT getting heads in any of the four coins ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.01/2 each so total would be another 1/16?

rational
 one year ago
Best ResponseYou've already chosen the best response.1Yep! so P(X=0) is 1/16 and P(X=4) is also 1/16

rational
 one year ago
Best ResponseYou've already chosen the best response.1Now, whats the probability of getting exactly ONE head ?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I would think 1/2 but i know thats not it

rational
 one year ago
Best ResponseYou've already chosen the best response.1one way to get exactly ONE head is : H T T T

rational
 one year ago
Best ResponseYou've already chosen the best response.1notice that there are 3 other ways to get exactly ONE head : T H T T T T H T T T T H

rational
 one year ago
Best ResponseYou've already chosen the best response.1so the probability for getting exactly ONE head is 4/16 = 1/4

rational
 one year ago
Best ResponseYou've already chosen the best response.1see if that makes sense

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes it does, I see what you mean now. okay.

rational
 one year ago
Best ResponseYou've already chosen the best response.1dw:1432817476450:dw

rational
 one year ago
Best ResponseYou've already chosen the best response.1Yes! our work so far matches perfectly with option A

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Yes thats why I said A, the work matches A and not others
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